00339nam a2200121Ia 4500008004100000082002700041100002100068245004000089250001200129260004600141300001000187650002000197140113s9999    xx            000 0 und d  a631.3.06.006.2(021) K0  a" Hunt, Donnell"  aFarm power and machinery management  a3rd Ed.  b"USA : Iowa state university press, 1960"  a190p.  aFarm management